Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORTECHNICAL SERVICE BULLETINSOXYGEN SENSOR - VERIFYING CONNECTIONS AFTER REPAIRS
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Oxygen Sensor - Verifying Connections After Repairs
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Oxygen Sensor - Verifying Connections After Repairs
Group: 01
Number: 00-03
Date: Aug. 7, 2000
Subject:
OBDII Diagnostic Tips, Verifying Post Oxygen Sensor,
Connections after Repairs
Model(s):
All V6 or V8 Engines 1996-->
with - 2 Post Oxygen Sensors
Service
During any repair that requires removing both post oxygen sensors or disconnecting their leads from the wiring harness:
- Mark both left and right post oxygen sensors and wiring harness leads prior to disconnecting and removing.
After installing the post oxygen sensors or when reconnecting harness leads to the oxygen sensors:
- Always! ensure that the correct post oxygen sensor lead is connected to the correct wiring harness connector.
- Always! ensure that the sensor is in the correct exhaust pipe.
CAUTION!
While making repairs, failure to connect right and left post oxygen sensor leads to the correct right and left wiring harness connectors can cause an increase in exhaust emissions!
Number: 00-03
Date: Aug. 7, 2000
Subject:
OBDII Diagnostic Tips, Verifying Post Oxygen Sensor,
Connections after Repairs
Model(s):
All V6 or V8 Engines 1996-->
with - 2 Post Oxygen Sensors
Service
During any repair that requires removing both post oxygen sensors or disconnecting their leads from the wiring harness:
- Mark both left and right post oxygen sensors and wiring harness leads prior to disconnecting and removing.
After installing the post oxygen sensors or when reconnecting harness leads to the oxygen sensors:
- Always! ensure that the correct post oxygen sensor lead is connected to the correct wiring harness connector.
- Always! ensure that the sensor is in the correct exhaust pipe.
CAUTION!
While making repairs, failure to connect right and left post oxygen sensor leads to the correct right and left wiring harness connectors can cause an increase in exhaust emissions!
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.